Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina

Lakes are excellent sensors of environmental change, including climate change. Chironomids (Insecta, Diptera) and ostracods (Crustacea) are among the most useful biological indicators for paleoenvironmental reconstruction found in lake sediments, due to their sensitiveness to environmental variables...

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Detalles Bibliográficos
Autores principales: Massaferro, Julieta, Laprida, Cecilia, Orpella, Germán, Mercau, J. Ramón
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Fossil chironomids
Ostracods
Laguna El Chaltel
Patagonia, Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16727
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16727
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Paleontología
Fossil chironomids
Ostracods
Laguna El Chaltel
Patagonia, Argentina
spellingShingle Ciencias Naturales
Paleontología
Fossil chironomids
Ostracods
Laguna El Chaltel
Patagonia, Argentina
Massaferro, Julieta
Laprida, Cecilia
Orpella, Germán
Mercau, J. Ramón
Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
topic_facet Ciencias Naturales
Paleontología
Fossil chironomids
Ostracods
Laguna El Chaltel
Patagonia, Argentina
description Lakes are excellent sensors of environmental change, including climate change. Chironomids (Insecta, Diptera) and ostracods (Crustacea) are among the most useful biological indicators for paleoenvironmental reconstruction found in lake sediments, due to their sensitiveness to environmental variables. However, the use of these microfossils in quaternary studies for southern Patagonia is still limited and poorly understood because of the paucity of regional taxonomic and palaeonvironmental knowledge. The multi-proxy study of lacustrine sediments from Laguna El Chaltel presented here aims to partially fill this gap. Laguna El Chaltel is a permanent lake located at 49"58'25"S, 71"06'53"W in southern Patagonia, Argentina, in the semidesert steppe east of the Andes. A 60.8-cm short sediment core has been analysed in order to obtain information about the paleoenvironmental evolution of the lake during the last ca. 5000 yr BP. The <sup>210</sup>Pb<sup>237</sup>Cs dating gave an age of 4685 cal yr BP for the base of the core. The presence and abundance of littoral chironomids of the genus Polypedilum Kieffer suggest oscillations in the lake level during the timespan of the core, while variations in the relative abundance of the ostracod Limnocythere rionegroensis Cusminsky and Whatley indicate the onset of periods of evaporative concentration. Some geochemical and physical parameters such as TIC (total inorganic carbon), TOC (total organic carbon) and magnetic susceptibility show similar patterns evidencing important variations in lake dynamics.
format Objeto de conferencia
Resumen
author Massaferro, Julieta
Laprida, Cecilia
Orpella, Germán
Mercau, J. Ramón
author_facet Massaferro, Julieta
Laprida, Cecilia
Orpella, Germán
Mercau, J. Ramón
author_sort Massaferro, Julieta
title Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_short Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_full Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_fullStr Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_full_unstemmed Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_sort fossil chironomids and ostracods from a 5000 years- sediment sequence of laguna el chaltel, southern patagonia, argentina
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/16727
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